Centrifugal fan.



E. M BASSLER.

CENTRIFU AL FAN.

Patented May 23, 1916. 2 SHEETS-SHEET l.

.E. M. BASSLER.

'CENTRIFUGAL FAN.

APPLICATION FILED MAY 10, 1913.

l ,1 84,300. Patented May 23, 1916.

2 SHEETS-SHEET 2.

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EDWIN M. BASSLEE OF CHICAGO, ILLINOIS, ASSIGNOR TO'BAYLEY 6 0., OF

. MILWAUKEE, "WISCONSIN, A CORPORATIQN 0F VHSCiDNSIN.

cENTmrusnL FAN.

Application filed may 10, 1918. Serial No. scene.

To all whom it may concern:

Be it known that I, EDWIN BASSLER, a citizen of the United States, and a resident of Chicago, in the county of Cook and State of Illinois, have invented a certain new and useful Improvement in Centrifugal Fans, of which the following is a specification;

This invention relates to centrifugal fans and relates particularly to runners therefor.

The primary object of the invention is to provide an improved fan runner which will be oi light weight, strong and durable in construction, efi'ective in operation, and relatively inexpensive.

A further feature of my invention relates to a. fan construction particularly designed for fans of extreme width and diameter. Heretotore', so far as 1 am aware,,such fans have consisted of a series. of separate. sph ders, varying from two tofive, ouch consistingot cast. iron hubs and steel or wrought iron spokes usually formed by T-irons, the inner ends of which are cast directly into the hubs of the spiders, and the vanes or blades of the fan being secured to spokes of each spider and being continuous from side to side of said fan.

It is found in practice that it ispra'ctically impossible to cast the spiders sothatthe spokes thereof will run true orto finish said runners so that the shaft bearings in the hubs of the different spiders will be in alinement. As a consequence, either the fan or the tan shaft is-sprung out of shape, throwing the same out of balance and causing the same to run out of true. As a further consequence, in constructing and erecting. fans of this character, it is found necessary, after boring the hubs andtruing up the spokes, to mark each vane or blade of the fan for punching the rivet holes separately and directly from the holes in the spokes to which they are to be secured, thus necessitating setting the fan up in the-shop for the purpose of marking the-vanes or blades and then taking the fan apart for shipment and reassembling it on the job where it is to be used. As it relates to this feature, the object of my invention is to overcome the foregoin objectionable fea;

tures by providing a "an construction for large fans whereby all parts of the fan will be'uniform and may finished complete at the shop ready for erection on the job,

Specification of Letters Patent.

as shown at 3, the

returnees 2e, lor

thereof on the line 2--2 of 1; Fig. 3 is a fragmentary sectional view illustrating La modification; and l is a side view of a tan runner illustrating a fan construction for large tans. I will first describe in detail the em runner shown in Figs. 1 and 2 of the drawing.

Said fan runner comprises a hub]. which is provided with an axial bore 2 to receive the fan shaft end with a keyway 3 for securing said key to said fan shaft, and 4 designates a rim which is preferably made of sheet steel or other suitable sheet metal, and which is connected with-the hub 1 by means of spokes 5 made ofrodsor wires the outer ends of which are secured to the rim 4; and

the inner ends of which are secured to the hub 1. As shown, the extreme ends of the spokesare bent substantially at right angles, length of said bent-over portions of said spokes being substantially equal to the thickness of the .1-, and formed at the endsof said bent-over portions 6' are heads 7, the headed outer ends of said spokes being connected into bayonet slots 8 formed in said rim 4.

The inner ends of the spokes 5 are adapted to be secured to the hub 1 in any desired manner. As shown, the inner ends of said spokes extend through holes formed in lugs 9, 9 which form spaced series extending around said hub symmetrically on both sides of the plane of the the ends of said spokesv are nuts 10 which provide. convenient means for truing up said rim and for tightening said spokes and for adjusting the tension thereof in order to distribute the load uniformly among the different spokes. As shown, the lugs forming each series are staggered relatively to the lugs forming the other series. 7

With the described construction, it is obvious that the spokes 5 will form two series connected to the hub 1 at spaced points and rim 4 and threaded to which converge outwardly to the rim 4:. Preferably, also, the spokes 5 are tangent to a circle concentric with the hub 1, and connected to each lug 9, 9 are two spokes which are produced in opposite directions from their points of tangency to said circle, alternate spokes on the rim being connected to lugs of different series.

Secured to the rim 4. are the fan blades or vanes 11. In the preferable construction shown, said vanes or blades 11 "are concave on their front sides and are secured to the rim 4 by flanges 12 at the inner ends thereof which are riveted to said rim, the vanes on opposite sides of said rim being preferably arranged in pairs and each pair thereof being secured to said rim by the same rivets.

As shown, the outer ends of the blades or vanes 11 are given a slight set forwardly, as best shown in Fig. 2, which, with the dish of said blades or vanes, renders them very strong to withstand the pressure to which they are subjected in use. Where the fan is designed for developing high pressures, I contemplate strengthening said blades further by securing side plates to the outer ends thereof. This construction is shown in Fig. 3- 0f the drawings, in which 4 designates the rim of the runner, 5 the spokes, 11 the fan blades or vanes, and 13 side plates secured to the outer ends of said blades or vanes, convenient means for securing said side plates 13 to the outerends of said blades or' I have shown a runner of character, comprising three separate umts, each designated, as a whole, A, which are keyed to the with the fan runner shownin Figs. 1 and 2,

and need not, therefore, be further described.

I claim 1. A runner for a centrifugal fan, comprising a hub provided with a shaft opening, a rim consisting of a sheetv metalring disposed edgewise in a plane' substantially at right angles to the axis of saidhub, wire spokes which connect said hub and rim, and vanes secured to and which project laterally from said rim, the relation being such that said runner will be open inside of its rim, thus permitting air to pass freely therethrough, substantially as described.

2. A runner for a centrifugal fan comprising a plurality of separate units each of said units comprising a hub provided with a shaft opening, a rim consisting of a sheet metal ring disposed edgewise in a-plane substantially at right angles to the axis of its hub, wire spokes which connect said hub and rim, and vanes secured to and which project laterally from said rim, the relation being such that said runner will be open inside of said rim, thus permitting air to pass freely 'therethrough, substantially as described. 2

' In testimony that I claim the foregoing as my invention, I affix my signature in the presence of two subscribing witnesses this 19th day of April, 1913.

EDWIN M. BASSLER. Witnesses:

E. M. BASSLER, J12, MARY H. BIXEL. 

